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| Taxon | Status | Relationship Type |
|---|---|---|
| Formica rufa subsp. difficilis Emery | Original name/combination | |
| Formica rufa difficilis Emery | Subsequent name/combination | |
| Formica (Formica) difficilis Emery | Subsequent name/combination | |
| Formica habrogyna Cole | Original name/combination | junior_synonym |
| Formica difficilis var. consocians Wheeler | Original name/combination | junior_synonym |
| Formica consocians Wheeler | Subsequent name/combination | junior_synonym |
| Formica difficilis Emery | Subsequent name/combination | |
| Formica difficilis consocians Wheeler | Subsequent name/combination | junior_synonym |
| Citation | Annotation |
|---|---|
| Emery C., 1925: 256. | cataloged, placed in subgenus Formica (Formica) |
| Bolton B., 1995: 504. | cataloged, placed in microgyna species group |
| Creighton W. S., 1950: 499, 500. | keyed, description, distribution, synonymy, type information, placed in subgenus Formica (Formica), microgyna group |
| Wheeler W. M., 1904: 305. | distribution |
| Wheeler W. M., 1905: 399. | distribution |
| Wheeler W. M., 1910: 570. | distribution |
| Wheeler W. M., 1913: 116. | distribution |
| Wheeler W. M., 1913: 395, 477. | description, keyed, placed in microgyna group, subgenus Formica (Formica), distribution |
| Davis W. T., Bequaert J., 1922: 4, 19. | distribution |
| Sturtevant A. H., 1931: 77. | distribution |
| Brimley C. S., 1938: 560. | distribution |
| Wesson L. G., Wesson R. G., 1940: 101. | distribution |
| Cole A. C., 1943: 389. | synonymy |
| Buren W. F., 1944: 300. | keyed |
| Smith M. R., 1947: 623. | included in list of species of microgyna group of Formica (Formica) of the United States |
| Smith M. R., 1951: 778-875. | cataloged, distribution, placed in subgenus Formica (Formica) |
| Wheeler G. C., Wheeler J., 1953: 164. | description |
| Smith D. R., 1979: 1323-1467. | cataloged, distribution |
| Poole R. W., 1996: 793. | included in checklist of species of North America |
| Coovert G. A., 2005: 148, 152. | description, keyed, distribution |
| Determiner(s) | # of Records |
|---|
| Collecting Method | # of Records |
|---|